Bottomwater formation due to hydrothermal activity in Frolikha Bay, Lake Baikal, eastern Siberia
Bottomwater formation due to hydrothermal activity in Frolikha Bay, Lake Baikal, eastern Siberia
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西伯利亚东部贝加尔湖弗罗利哈湾热液活动形成的底水
DOI：
10.1016/0016-7037(95)00448-3
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发表时间：
1996
影响因子：
5
通讯作者：
J. Klerkx
中科院分区：
文献类型：
--
作者：
R. Kipfer;W. Aeschbach–Hertig;M. Hofer;R. Hohmann;D. Imboden;H. Baur;V. Golubev;J. Klerkx
地热水进入Frolikha湾，这是贝加尔湖北方一个著名的高地热通量地区，深度为400米。根据CTD剖面，热液水被确定为形成了一个异常底层，其温度（>0.15 °C）和盐度（>2.5 mg · kg−1）高于上覆水。由于湖水的夹带，一个明显的密集水层厚达40米，由其略高的盐度稳定，成为建立接近海湾底部。由此产生的异重流流出海湾，流向盆地的较深部分。由于氦同位素分析表明，热液水的地球化学特征与附近陆地上的温泉水相似，因此很容易将Frolikha湾的底层水解释为来自湖泊的普通淡水和来自大陆地壳的携带同位素重He的热液水的混合。由于其高的地壳氦含量，类似的热液成分甚至可能在北方盆地的开阔水域被确定。
Hydrothermal water enters Frolikha Bay, a well-known site of high geothermal heat flux in the northern part of Lake Baikal, at 400 m depth. On the basis of CTD profiles, the hydrothermal water is identified as forming an anomalous bottom layer with a higher temperature (>0.15 °C) and salinity (>2.5 mg · kg−1) than the overlying water. Due to the entrainment of lake water, a distinct dense water layer up to 40 m thick, stabilised by its slightly higher salinity, becomes established close to the bottom of the bay. The density current thus generated flows out of the bay towards the deeper parts of the basin. Since helium isotope analysis shows that the geochemical characteristics of the hydrothermal water are similar to those of water from nearby hot springs on land, the bottomwater of Frolikha Bay is easily interpreted in terms of the mixing of ordinary fresh water from the lake and hydrothermal water carrying isotopically heavy He from the continental crust. Because of its high crustal He content, a similar hydrothermal component may even be identified in the open water of the northern basin.